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This form of noise would change (generally) with engine RPM. 
		
	
		
		
		
		
		
	
		 
		
	
	
	There are often 2 types of noises created. 1 - "static" noise (It's kind of hard to describe in text) 2 - Very noticeable RPM-related noise. Both change with RPM, as the engine fires faster. Both can come from the same source. Just FYI . . .  | 
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